Description: -Support audio equipment with audio input for wireless audio reception and transmission; support automatic search for connecting Bluetooth devices to realize wireless audio transmission. -Built-in AEC cancellation and ANC noise cancellation circuit, high fidelity stereo, clearer sound quality. -Built-in enhanced signal transmission circuit, automatic memory connection function, faster connection. -Support AUX output, headphones; compatible with dual lossless audio format; support voice prompts, simple and clear operation. -Built-in battery, long battery life; Bluetooth 4.2, low power consumption. -Smart compatible, Android, IOS system phone and PAD, and all Bluetooth audio devices, audio devices with audio input. Specification: Supporting protocols: A2DP, AVRCP, HFP, SPP HID Receiving operating current: 43mA Transmit working current: 60mA Standby current:<18mA Built-in battery specification: 400MAH Charging current: 200mA Life time: >8H Bluetooth distance: >10M Charging method: Micro USB 5V/0.5A Input / output connection: 3.5mm stereo interface Package Includes: 1Piece Bluetooth Audio Receiver Transmitter 1Piece RCA Cable 1Piece 3.5mm Audio Cable 1Piece USB Charging Cable 1Piece User Manual Note: Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you.